《Table 4.The tensile properties of the alloy under different processes》

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《Effect of pre-recovery on microstructure and properties of rolled Al-12.18Zn-3.31Mg-1.43Cu-0.20Zr-0.04Sr aluminum alloy》

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To further explore the specific composition of the undissolved second phase in the alloy，energy-dispersive spectroscopy（EDS）was performed on the regions shown in Fig.4，where the A，C，and E regions are the matrix and the remaining regions are the undissolved second phase.The analysis results are listed in Table 1.The results of the EDS analysis show that the matrix composition differs slightly when the alloy is subjected to different processes.Compared with the Zn and Mg contents in the matrix of the alloy without heat treatment，those in the matrix of the alloy after solution and pre-recovery–solution heat treatment were increased；however，the Cu content was slightly decreased.Compared with the Zn，Mg，and Cu contents of the matrix，those of areas B，D，F，and H are substantially greater.